Crab lice (‘crabs’) and Scabies

Microbiology

  • Crabs- Phthirus pubis
  • Scabies- Sarcoptes scabeii

Both are acquired by genital skin-skin contact

Clinical picture

  • Crabs
    • Itchy pubic area
    • Patient may have noticed visible nits (egg cases) or lice
  • Scabies
    • Also itchy
    • May be able to see burrows under the skin

Diagnosis

  • Clinical appearance, microscopy is rarely needed

Treatment

  • Malathion lotion (Derbac-M)

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